Power-transmission means for operating dynamos.



A. C-HURCHWARD. POWER TRANSMISSION-MEANS ron OPERATING DYNAMOS.

APPLICATION FILED-1AM. 2. m4.

Patentedfiept. 14, 1915.

fZZYIGE/XTOR ALEXANDER CHURCHWAQD, I OF BOSTON, .MASSACHUSET'IS.

?OWER-TRANSMISSION MEANS FOB OPERATING DYNAMOS.

/ Application Med January 2, 1914. Serial No 809,956. 7

To all whom it may concern.

Be it known that I, ALEXANDER CHURCH- WARD, a citizen of the United States, residing at Boston, in the county of Suffolk and State of Massachusetts, have invented certain new and useful Improvements in Power-Transmission Means for Operating 4 Dynamos, of which the following is a specifioation. v

The object of my invention is the provision of means for operating a dynamo electric machine at substantially a constant 1 speed by power transmitted from the shaft of an internal combustion or other engine rotating at a variable speed,

The invention consists in connecting a pulley on the armature shaft of a dynamo with a pulley on the rotary shaft of an internal combustion engine by means of a beltand interposing between said pulleys a third pulley which is secured to a shaft having a fan or air propeller, said fan pulley and shaft preferably being movably supported and the pulley frictionally bearing against the belt under spring tension.

It further consists in certain novelties of construction and combinations of parts as herein set forth and'claimed.

The accompanying drawing illustrates one embodiment of the invention constructed and arranged according'to the'be'st mode of procedure I have so far devised for the purpose, the same being shown in connection with the front end of an automobile.

Figure 1 is a side view in elevation of the front .end of an internal combustion engine, such as is used to propel an automob1le,a ra-.

diator and belt gearing connecting the engine shaft with a dynamo electric machine and a fan blower. Fig.v 2 is an elevation view of the engine pulley, dynamo and its pulley and the fan blower, as seen when looking in the direction of the arrow, Fig. 1,

i the radiator being omitted.

A designates the front caseof an internal combustion eng1ne;-B, a

\ cylinder inclosing a reciprocating piston; C,

the crank shaft of the engine; D, a pulley keyed on the shaft; E, a dynamo or electric generator of any type; F, the armature shaft; G, a pulley keyed on the shaft; H, a

'fan shaft; 1, apulley fixed on the shaft; J,a

end of'the crank fan or air propeller fixed on the shaft; K, an arm pivoted at one end to a support L on the engine 'case and having a bearing M at the free end within which the shaft H is journaled; N, a slotted hole in the pivoted arm;

0, a fixed guide pin loosely fitting .the slot and seated in' the engine case; P, a helical sIpripg secured at one end to the pivoted arm and adjustably connected by athreaded shank Qand ad1usting nut R at the opposite end to an element fixed to or projecting from the engine case; and T is an endless belt of any suitable type frictionally engaglng and connecting the. engine shaft, namo and fan pulleys. The pulley on the Specifications! Letters Patent. Patented Sept, 14, 1915. i

ower crank shaft turns in the direction indicated by the arrow.

I have found in practice that-the interpopulley and the generator shaft pulley causes the belt to slipupon the crank shaft pulley so the armature will rotate at substantially a, constant speed under varying speeds of the crank shaft pulley. The power required to drive thefan increases directly as the square of its speed and the increasedload sition of the fan between the crank shaft thus imposed under the speed variations of the crank shaft pulley occasions the proper shpping :of the belt upon-the said crank shaft pulley to substantially secure the desired constant speed of the generator shaft pulley and armat ure: a

What I claim is: v V 1'. The combination of a power shaft hairwith a pulleyupon the. armature shaft, a shaft, a pulleyand a fan carried by said shaft, and a belt connecting the said three pulleys. g K

2. he combination of a power shaft hav- 7 ing a pulley, an electric enerator having a pulley, a spring actuate support, a pulley and fan journaled to said spring-actuated support, anda belt @onnecting the said three pulleys.

ing a pulley, an electric generator provided 7 3. The combination of a rotary power i shaft having a pulley, an electric generator having a rotary shaftprovided witha pulley, a belt connecting said pulleys, and means for interposing a rotary fan pulley rresistance upon the interior surface ofpthe belt between said pulleys. a

4. The combination of a rotary power In testimony whereof I eflix iny signature ihaft having a pullle an elgctgic gfineratolr in presence of two Witnesses.

swing a rotary s a t provi e wit a pn w ley, a belt connecting said pulleys, and ALEXANDER CHURLHWARD' 5 means for interposing a yielding rotary fan Witnesses:

pulley resistance upon the interior surface R. fiorr'Mosns,

- of the belt between said pulleys. 7 WILLIAM B. Moses. 

